Chevrolet Colorado ZR2 Bison Takes on the 1,500-Mile Rebelle Rally Challenge
The Chevrolet Colorado ZR2 Bison is preparing for one of the most demanding off-road challenges in North America as two General Motors employees get ready to compete in the 2026 Rebelle Rally. Covering approximately 1,500 miles across three states over eight days, the competition tests drivers and navigators through challenging terrain, complex navigation tasks, and unpredictable outdoor conditions. Rather than rewarding outright speed, the rally emphasizes precision, teamwork, strategic decision-making, and the ability to navigate difficult routes using traditional tools.
Representing General Motors (GM), Nicole McKinnon, program manager for off-road racing, and Savannah Theisen, vehicle software and integration lead, will compete as a team under the name Milford Offroad Chicks. McKinnon will serve primarily as the driver, while Theisen will take responsibility for navigation. However, both competitors are comfortable exchanging roles when circumstances require it.
Their vehicle of choice is the Chevrolet Colorado ZR2 Bison, an off-road-focused midsize pickup developed through a collaboration between Chevrolet and American Expedition Vehicles (AEV). Equipped with specialized off-road hardware and designed to handle demanding environments, the truck will face rocky trails, desert landscapes, and other obstacles throughout the competition.
For the team, the Rebelle Rally is more than a test of vehicle capability. It is also an opportunity to demonstrate how a production-based pickup equipped with commercially available accessories can perform in an extreme off-road environment.
Understanding the Rebelle Rally Challenge
The Rebelle Rally is an all-women off-road navigation competition founded by Emily Miller. It brings together teams of two competitors who must navigate challenging routes across remote terrain while collecting points at designated checkpoints.
Unlike conventional motorsport competitions, the event does not prioritize maximum speed, acceleration, or horsepower. Instead, participants must demonstrate accurate navigation, careful driving, patience, and effective communication. Teams that make sound decisions and follow their planned routes efficiently can gain an advantage over competitors who rely primarily on vehicle performance.
The competition covers approximately 1,500 miles over eight days, requiring participants to remain self-sufficient for extended periods. Teams carry camping equipment and personal supplies, navigation tools, and vehicle recovery equipment in case their vehicles become stuck or require assistance.
The demanding schedule also requires competitors to manage fatigue and maintain concentration throughout long days in the wilderness. Every route decision matters, and a small navigation error can result in lost points or wasted time.
Participants must plan their movements carefully while assessing terrain conditions and determining the most effective way to reach checkpoints. This approach places a premium on practical driving skills and the ability to adapt when conditions change.
The event’s emphasis on navigation rather than speed allows a wide range of production vehicles to compete. By establishing rules that favor vehicles available to the public, the Rebelle Rally highlights the capabilities of everyday off-road platforms rather than highly modified racing machines.
General Motors Employees Form the Milford Offroad Chicks
McKinnon and Theisen developed their partnership through their professional connections at General Motors. The two began talking at an event for women working at the company and quickly discovered that they shared several interests, including a passion for outdoor activities and a love of keeping chickens.
Although they had known of each other through their years at GM, their conversation helped establish a stronger connection. McKinnon, who had previously participated in the Rebelle Rally in 2024, invited Theisen to join her for the 2026 competition.
The pair selected the name Milford Offroad Chicks to reflect their workplace, enthusiasm for off-road driving, and shared interest in raising chickens.
For McKinnon, choosing the right teammate was an important part of preparing for the rally. The event requires competitors to spend nearly every moment together during the competition, making communication and attitude critical to success.
McKinnon explained that maintaining a positive outlook was one of her priorities when selecting a partner. Spending long hours together in difficult conditions means that frustration and negative thinking can quickly affect a team’s ability to make good decisions.
Mistakes are inevitable during an event of this scale, but competitors must recover quickly and concentrate on the next challenge. A constructive attitude helps teams assess setbacks objectively and avoid allowing one problem to influence the remainder of the day.
The Milford Offroad Chicks intend to build their strategy around these principles. Clear communication, mutual support, and the ability to remain calm under pressure will be central to their efforts throughout the rally.
Daily Preparation and Navigation Strategy
Each day of the Rebelle Rally begins early, with competitors waking around 5 a.m. to prepare for the day’s route. As daylight emerges, teams review their navigation plans and determine how to collect as many checkpoint points as possible.
The process requires a combination of preparation and flexibility. Teams must study their route information, identify possible challenges, and make decisions about the order in which they will approach checkpoints.
The competition typically requires participants to pursue approximately 20 to 30 checkpoints each day. Some checkpoints are easy to identify because they are marked with prominent flags. Others are much harder to locate and require teams to determine their precise geographic positions.
To make the challenge more demanding, competitors cannot depend on modern GPS navigation systems. Mobile phones must be sealed, and other GPS-enabled devices must be disabled in accordance with the event’s rules.
Instead, teams rely on paper maps, compasses, rulers, and their own navigation skills. These traditional tools require participants to interpret geographic information, calculate distances, and identify the correct direction of travel.
For unmarked checkpoints, teams must use a specialized device to record their exact longitude and latitude. Arriving outside the permitted radius can result in lost points, making precision just as important as route planning.
This navigation-focused format creates a competition in which the fastest route is not necessarily the best route. Teams must balance the time required to reach checkpoints against the risk of taking a difficult or inaccurate route.
For Theisen, the navigation role will involve interpreting the route, helping the team maintain its direction, and communicating decisions clearly to McKinnon. The driver’s ability to respond to that information will be equally important, particularly when the vehicle encounters difficult terrain.
Chevrolet Colorado ZR2 Bison Built for Demanding Terrain
The Chevrolet Colorado ZR2 Bison has been selected for its off-road capability and its suitability for a competition that places significant demands on both the vehicle and its occupants.
Developed in collaboration with AEV, the ZR2 Bison incorporates specialized components intended to improve protection, traction, and performance when traveling over challenging surfaces.
The Milford Offroad Chicks have equipped their truck primarily with GM and Chevrolet Performance accessories. Their approach reflects a deliberate effort to demonstrate the capabilities of a production-based vehicle supported by commercially accessible equipment.
Key features of the Colorado ZR2 Bison include:
- An AEV heavy-duty front bumper designed to accommodate a winch.
- Larger fender flares to accommodate the vehicle’s off-road wheel and tire configuration.
- 17-inch beadlock-capable wheels.
- 35-inch mud-terrain tires for traction on demanding surfaces.
- Boron-steel skid plates to help protect vulnerable underbody components.
- Rocker protection to reduce the risk of damage along the vehicle’s lower sides.
- Front and rear Multimatic Jounce Control Dampers designed to support performance over rough terrain.
These components are intended to help the truck manage obstacles encountered during off-road driving. Underbody protection is particularly important when crossing rocky sections, where contact with exposed terrain can damage mechanical components. Rocker protection provides additional defense when maneuvering through narrow trails or around large obstacles.
The mud-terrain tires are designed for challenging surfaces, while the vehicle’s suspension technology supports its ability to handle uneven ground. Together, these features contribute to a configuration suited to extended off-road use.
McKinnon believes the truck has substantial capability and is looking forward to testing it further than during her previous participation in 2024. She describes the Bison as a rugged workhorse capable of handling the difficult conditions expected during the event.
The competition will provide an opportunity to evaluate how the vehicle performs across a prolonged period of demanding driving, where durability and consistent operation are as important as individual performance characteristics.
Production-Based Vehicles Remain Central to the Competition
One of the defining characteristics of the Rebelle Rally is its focus on production vehicles. The event was established around the idea that competitors should be able to demonstrate their skills without relying on custom-built trophy trucks or heavily specialized racing vehicles.
Under the competition’s vehicle requirements, eligible models must be in current production, and a comparable version of the vehicle must be available for public purchase within 180 days of the event.
The rules also establish equipment requirements intended to support practical off-road competition. Vehicles must have at least two recovery tow points, one at the front and another at the rear. Tire sizes are limited to a maximum of 37 inches, and qualifying tires must be available to the public through conventional dealerships or regular online retailers. Certain aftermarket suspension modifications may also be permitted under the rules.
These requirements help maintain a connection between the vehicles competing in the rally and those available to consumers.
For Chevrolet, the Colorado ZR2 Bison’s participation provides an opportunity to demonstrate the potential of a production-based off-road pickup under demanding conditions. The vehicle’s configuration combines factory-supported components with accessories designed to improve its suitability for challenging terrain.
McKinnon has emphasized the team’s goal of showing that a GM vehicle equipped with dealer-accessible, warranty-backed components can successfully participate in a demanding off-road event.
This approach may also be relevant to consumers who want to improve their vehicles’ off-road capabilities without making extensive custom modifications. The rally provides a challenging environment in which to assess the practical value of off-road engineering and accessories.
Mental and Physical Endurance Will Be Essential
Although the vehicle’s technical specifications are important, the Rebelle Rally also places considerable demands on competitors’ physical and mental endurance.
Long driving days, early starts, remote campsites, and complex navigation tasks require participants to maintain concentration for extended periods. The absence of conventional digital navigation adds another layer of difficulty, as teams must interpret maps and make decisions without the assistance of familiar GPS guidance.
Recovery situations can also test a team’s patience and problem-solving abilities. Carrying recovery equipment is an essential part of preparing for the possibility that a vehicle may become stuck or need help negotiating difficult terrain.
In such situations, the competitors must assess the circumstances, communicate effectively, and determine the safest practical response. Poor decisions made under pressure can create additional difficulties, making a calm and methodical approach valuable throughout the event.
For the Milford Offroad Chicks, maintaining a positive attitude is a key part of their preparation. Their strategy recognizes that successful competition involves more than reaching checkpoints. It also requires managing unexpected setbacks and making the most of the time and resources available.
Theisen is approaching the challenge with an emphasis on finding solutions rather than focusing on what could go wrong. She has highlighted communication and the importance of regrouping during intense moments, particularly when the team becomes uncertain about its position or route.
This mindset reflects the central philosophy of the Rebelle Rally: participants must combine technical skills with resilience and teamwork to navigate difficult conditions successfully.
A Platform for Demonstrating Off-Road Capability
The 2026 Rebelle Rally represents an opportunity for General Motors employees to put their professional experience and personal interests into practice. McKinnon’s work in off-road racing and Theisen’s background in vehicle software and integration bring different perspectives to the competition.
Their partnership also highlights the importance of collaboration between people with complementary skills. While McKinnon concentrates primarily on driving, Theisen’s navigation responsibilities will help guide the team across the course. Both roles require careful judgment and consistent communication.
The Chevrolet Colorado ZR2 Bison will face a combination of terrain challenges that test its traction, underbody protection, suspension performance, and overall durability. At the same time, the competition will evaluate the team’s ability to navigate accurately and work together under pressure.
By using a production-based truck equipped largely with GM and Chevrolet Performance accessories, the Milford Offroad Chicks aim to show how a commercially available off-road vehicle can be applied to a demanding endurance challenge.
Ultimately, the Rebelle Rally is about much more than vehicle specifications. Success depends on making sound decisions, navigating precisely, responding effectively to unexpected situations, and maintaining a strong partnership throughout the journey.
As McKinnon and Theisen prepare to begin the 1,500-mile challenge, their focus remains on teamwork, careful navigation, and getting the most out of the Colorado ZR2 Bison. Their participation will put both the truck and its crew to the test in one of the most demanding production-vehicle off-road competitions, while highlighting the capabilities of Chevrolet’s off-road engineering.
Source Link:https://news.gm.com/
